Workers trying to log in to Microsoft Outlook experienced unexpected problems Monday morning, with some users receiving error messages and unexpected signouts.

On its official Microsoft service status page, the company confirmed that some Microsoft 365 Business and Enterprise customers were experiencing a service interruption and directed them to X for more information.

The Microsoft 365 Status page on X stated that some customers were unable to log in to the email software.

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“We’ve discovered some users may experience intermittent sign‑in failures, including ‘too many requests’ errors, or unexpected sign‑outs. We’re analyzing service telemetry further to identify any potential next steps and mitigation actions.”

Around 9:35 a.m. ET, the Microsoft 365 Status X account, posted a further update stating that the issues were ongoing.

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The platform DownDetector also reported a spike in user error reports beginning around 5 a.m. ET Monday morning, with a majority of users identifying login issues as the problem. Microsoft Outlook error reports continued to climb on Monday morning as U.S. workers began their workweek.

(Disclosure: DownDetector and Mashable are both owned by the same parent company, ZiffDavis.)

Meanwhile, Microsoft users on X complained that they were still unable to access Outlook and criticized Microsoft for the lack of information regarding the issue. The Microsoft service status page directs users to X for more information, while the Microsoft 365 support profile on X directs users back to the website status page.

Microsoft Outlook also experienced an outage in January.

This is a developing story…

UPDATE: Apr. 27, 2026, 11:21 a.m. EDT This article has been updated with more information about the Microsoft Outlook outage, which is ongoing as of this writing.